Since when in modern times has China provided security guarantee to Saudi Arabia or any country for that matter?
Seriously it seems to me like some people are wishing or hoping so much for China to get involved in the political abd geopolitical affairs of other countries so much so that they project that wishes/hopes into reality. Lol
China is not in the habit of getting involved in such things as i said before. Whether we like it or not but thats the current CCP policy of non interference in others political affairs since the death of Mao and opening up of the country. The US,Russia , UK, France etc have long been used in throwing their power around all over the world and getting involved politically and militarily in countries political affairs around the world so much so that its almost part of their national fabric but China doesn't and rightly so
So if you are a leader of those countries and you want to maintain your rule or position then of course it will make more sense to keep the US closer since you know they are more willing to get involved in such things compared to China who doesn't like getting herself involved in such endeavours apart from sticking to business and investment. So we should learn to separate those 2 apart.
Saudi Arabia is building up its own military, including UAE and the rest of the region too, because they see that they can expect nothing from the collapsing US, no kind of protection.
A few years ago they didn't do shit when Iran bombed Saudi oil fields, when Saudis went to war in Yemen when Iran basically took the entire Iraq, Assad consolidated Syria, etc,
The US gets humiliated in Syria, and Iraq, on a daily basis, and with that many soldiers left, they could be easily taken as hostages by Shia para-millitaries, America should all pull them back and stop getting embarrassed.
Do you know how the US can provide security? If they went in, mobilized millions of soldiers, and invaded and controlled Iran. But that is a science faction in today's balance of power between them. The US has no guts for something like that because it would be a humiliating defeat.
So, then, if that clearly can't happen, a way better security guarantee for Saudis and smaller nations around them is to have China control Iran and have some kind of peaceful coexistence long-term with Iran through that.
Do you think the military is the only kind of way to get influence abroad? Then you are outdated around 30 years, that's the most expensive way to spread influence.
China does it many times smarter, for less money lost, and has way more influence than the US around the Global South, especially in the Middle East today, creating economic, technological, diplomatic, scientific, and win-win conditions for both themselves and the countries in question.
Do you see what happens when you focus entirely outward like in the US? Then you have a near civil war inside the country, and are overextended,
Unlike China which has a regular army regionally focused, and a budget and society focused on stability, harmony, and societal cohesion, and PAP, etc.
That's a 5000-year-old mindset, always first build up on your defense, and then use what is left to have influence abroad, but first secure internal peace and stability.
That is something that arrogant, young, 250-year-old America doesn't understand, and that's why they will collapse in a civil war, they are Third World level divisions and instability, Africa is better.
They are going into trillions of debt to keep their foreign military presence and strong image while internally their citizens are the unhappiest in the world.
But regarding the military itself, way cost-efficient way to spread your military abroad is to use those civilian BRI ports as stop-overs into the world instead of building expensive bases, there is no need for that many expensive aircraft carriers, this is the year 2023, and you live in 1993.